Comet 103P/Hartley 2 viewed from EPOXI Deep Impact 
on 4 Nov. 2010. Credit: NASA/JPL/UM.

In a NASA/Goddard news item yesterday, EPOXI manager Tim Larson tells that, "From all the imaging we took during approach, we knew [103P/Hartley 2] was a little skittish... It was moving around the sky like a knuckleball and gave my navigators fits, and these new results show this little comet is downright hyperactive." See also a U. Maryland report. November 10th image credit: NASA/JPL/UM.


Contents  on 17 June '11

Resources:

The latest A/CC news is available via framed access, RSS news feed RSS news feed, or redirection. - Note: A/CC has a main Web site and also a backup site with its own duplicate RSS news feed.

Navigation tips: Use the << and >> arrows on the menus for each regular section (Observers, Risks, etc.) to move to the previous and next day's news for that section. Use the Index menu item to access specific days through a calendar interface. And use the all-up news archive to access news from any time since A/CC began in early 2002. To keep track of what's new each day, watch the Chronology section.

NEOCP Activity  on 17 June '11

The MPC's NEO Confirmation Page has 2 listings

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had two objects listed. Both of these were "one nighters."

To learn how observers use the NEOCP, see the Practical guide on how to observe NEOCP object at Suno Observatory by Birtwhistle et al.

New MPECs  on 17 June '11

Minor Planet Electronic Circulars

As of last check at 2359 UTC, there have been two MPECs posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.


MPEC 2011-M11 - "17:30 UT" - Observations and Orbits of Comets


<< DOU on 17 June '11 >>  MPEC 2011-M10 - "07:06 UT" - Daily Orbit Update

Observers  on 17 June '11

A total of 26 observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 16 in MPEC 2011-M10 -- 2011 LT17, 2011 LJ1, 2011 LD19, 2011 LC19, 2011 LA19, 2011 KN9, 2011 HL7, 2011 GQ65, 2011 AO52, 2010 NJ1, 2010 JU39, 2008 RJ1, 2008 HE, 2004 LH, 2003 AL73, 281375
B96Brixiis Obs. in Belgium, 6 in MPEC 2011-M11 -- C/2011 A3, C/2010 G2, C/2009 UG89, C/2009 S3, C/2008 FK75, C/2007 Q3
703Catalina Sky Survey (CSS) in Arizona, 3 in MPEC 2011-M11 -- C/2009 Y1, C/2009 UG89, 71P
807|Robert Holmes via Cerro Tololo Inter-American Obs. in Chile, 1 in MPEC 2011-M10 -- 2005 LY19
A77Chante-Perdrix Obs. in France, 7 in MPEC 2011-M11 -- C/2010 X1, C/2009 P1, C/2006 S3, 130P, 71P, 48P, 27P
372Geisei Obs. in Japan, 3 in MPEC 2011-M11 -- C/2009 Y1, C/2009 P1, 213P
J95Great Shefford Obs. in England, 1 in MPEC 2011-M10 -- 2011 LA19
G92Jarnac Obs. in Arizona, 1 in MPEC 2011-M11 -- 213P
585Kiev Comet Station in the Ukraine, 2 in MPEC 2011-M11 -- C/2011 A3, 213P
D95Kurihara Obs. in Japan, 2 in MPEC 2011-M11 -- C/2011 C1, 27P
704LINEAR in New Mexico, 2 in MPEC 2011-M11 -- C/2011 F1, C/2009 Y1
213Montcabre Obs. in Spain, 1 in MPEC 2011-M11 -- C/2009 P1
G96Mt. Lemmon Survey in Arizona, 1 in MPEC 2011-M11 -- 31P
C23Olmen Obs. in Belgium, 1 in MPEC 2011-M11 -- C/2010 G2
F51Pan-STARRS 1 in Hawaii, 1 in MPEC 2011-M11 -- C/2011 L4
B49Paus Obs. in Spain, 1 in MPEC 2011-M11 -- C/2009 UG89
H06%Ernesto Guido in Italy via RAS Obs. Mayhill in New Mexico, 1 in MPEC 2011-M11 -- C/2009 P1
H06|Hidetaka Sato in Japan via RAS Obs. Mayhill in New Mexico, 7 in MPEC 2011-M11 -- C/2011 L3, C/2011 C1, C/2009 Y1, C/2009 P1, 240P, 73P, 27P
D90`Kevin Hills in England via RAS Obs. Moorook in South Australia, 1 in MPEC 2011-M11 -- C/2009 F4
473Remanzacco Obs. in Italy, 1 in MPEC 2011-M11 -- 123P
C09Rouet Obs. in France, 1 in MPEC 2011-M11 -- C/2009 P1
A71Stixendorf Obs. in Austria, 2 in MPEC 2011-M11 -- C/2006 S3, 27P
I40TRAPPIST in Chile, 13 in MPEC 2011-M11 -- C/2011 C3, C/2011 C1, C/2010 X1, C/2010 FB87, C/2010 B1, C/2009 P1, C/2006 W3, C/2006 S3, 213P, 103P, 43P, 29P, 9P
926Tenagra II Obs. in Arizona, 1 in MPEC 2011-M11 -- C/2011 K1
H10Tzec Maun Obs. Mayhill in New Mexico, 1 in MPEC 2011-M11 -- C/2009 P1
D96Tzec Maun Obs. Moorook in South Australia, 3 in MPEC 2011-M11 -- C/2010 X1, C/2009 P1, C/2009 F4
H47Vicksburg Obs. in Mississippi, 3 in MPEC 2011-M11 -- C/2011 L3, C/2009 Y1, C/2006 S3
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 17 June '11

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS and JPL at 2359 UTC)
See the CRT page for a list of all objects rated recently as risks and our ephemerides page for a list of risk-listed objects under current observation.
The time horizon for JPL is 100 years from today and for NEODyS is usually the year 2090. Both also post impact solutions beyond 100 years for a few special objects.
For the latest official risk assessments, and for explanations of the terminology, see the JPL NEO Program Sentry and NEODyS CLOMON risk pages.
0000NNN000

Object

Risk
Monitor
When
Noted
UTC
0000T0000
Year
Range

VI
#
000NN00
Prob
Cum
T0000
PS
Cum
T0000
PS
Max

T
S


Notes for Today's Latest Risk Assessments
2011 LC19NEODyS1514R E M O V E D-
2011 LA19JPL Sentry1514R E M O V E DJPL: Risk listing removed at 0949 UTC.
2011 LT17JPL Sentry15142072-209631.2e-06-4.49-4.670JPL: "Analysis based on 80 observations spanning 6.7927 days (2011-Jun-09.33984 to 2011-Jun-16.132524)." Diameter approximately 0.140 km. from mean, weighted H=21.9.
NEODyS15142072-208837.58e-07-4.64-4.650NEODyS: "Based on 81 optical observations (of which 1 are rejected as outliers) from 2011-06-09.341 to 2011-06-16.133."

Legend: VI# = VI count, Prob Cum = cumulative probability, PS Cum/Max = cumulative/maximum Palermo Scale, TS = Torino Scale

An impact solution, also known as a "virtual impactor" (VI), is not a prediction but rather a possibility derived from a variant orbit calculation that cannot be eliminated yet based on the existing data. Elimination can come quickly with just a little further observation or may take weeks or months, sometimes years. Once superceded or eliminated, a former impact solution has zero relevance to an object's risk. See Jon Giorgini's "Understanding Risk Pages" to learn more.

Chronology  on 17 June '11

Times are UTC for when items were noted or added by The Tracking News.

1801Grabbed MPEC 2011-M11 - Observations and Orbits of Comets - see above
1514Noted that JPL Sentry has removed 2011 LA19 as an impact risk - see above
Noted that NEODyS has removed 2011 LC19 as an impact risk - see above
Noted that JPL Sentry has updated its 2011 LT17 risk assessment - see above
Noted that NEODyS has updated its 2011 LT17 risk assessment - see above
Grabbed MPEC 2011-M10 - Daily Orbit Update - see above